JPH02218307A - Hair dryer - Google Patents

Abstract

PURPOSE:To dry hair effectively without damaging the hair by providing a far infrared ray radiating body having a large radiation amount of infrared ray having about 3mu of wave length. CONSTITUTION:A far infrared ray heater 4 is formed with a spiral groove 44 on the outer peripheral surface of a tubular heater bed 41 converging toward the distal end side. A heater wire 42 is wound along the groove 44, while a far infrared ray radiating body 43 is further applied and baked or flame sprayed fixedly to the outer peripheral surface. A material showing at least 90% of radiation efficiency over the whole far infrared ray wave length region, particularly higher radiation efficiency near 3mu wave length is used for the far infrared ray radiating body 43 which is set to be heated to 50-600 deg.C by the heater wire 42 so that energy peak wave length approaches 3mu. Since such a far infrared ray air heater has a high absorption rate of said wave length far infrared ray in water wetted hair, the hair can be quickly dried and further the absorption rate of far infrared ray having said wave length is reduced to about 1/4 when the hair is dried up, so that the hair is not damaged.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a hair dryer that promotes hair drying by radiation of far infrared rays.

[Conventional technology]

As a hair dryer equipped with a far-infrared radiator, JP-A-63
There is a hair dryer disclosed in Japanese Patent No. 18092. As shown in FIG. 6, a honeycomb-shaped far-infrared radiator 49 is placed at the hot air outlet of the main body 1 of the hair dryer, and the far-infrared radiator 49 is radiated by the hot air sent out by the main body 1. It is heated and far-infrared rays are emitted from the far-infrared radiator 49.

[Problem to be solved by the invention]

However, in this one, the far infrared radiator 49 is 100 to 1
Since it is only heated to 50℃ and its surface area is small, the amount of infrared energy is small.The amount of far-infrared energy W is calculated as W = ε・σ・(T-T, )'・S ε: Emissivity σ: Stefan-Boltzmann coefficient (constant) T1: Ambient temperature S: This is because it is the surface area of the radiator. For example, even if the input voltage required to generate hot air is IKW, the amount of far-infrared energy The output power is only about 10W, which is inefficient for drying hair.Furthermore, when the emissivity of the far-infrared radiator 49 is measured, as shown in FIG. 7, it maintains a large emissivity in the wavelength range of 5μ to 8μ. However, the emissivity in the wavelength range of 10μ or more and between 2.5μ and 5μ is low: when the absorption rate in the far infrared wavelength region of wet hair is measured, as shown in Figure 4, the emissivity is 3μ.
Since the absorption rate of far infrared rays in the vicinity of 6 μ and wavelengths of 10 μ or more is high, in the far infrared radiator 49 with the above emissivity, the wavelength of 6 μ is effective for drying wet hair. This 6
The absorption rate for far infrared rays at wavelengths around μ is lower than the absorption rates for wavelengths around 3μ and 14μ, and is not very effective in this respect as well. The present invention has been made in view of these points, and its purpose is to provide a hair dryer that can efficiently and effectively dry wet hair without damaging the hair. There is something to do.

[Means to solve the problem]

The hair dryer according to the present invention is characterized in that it is equipped with an infrared radiator that emits a large amount of infrared radiation at a wavelength of around 3 μm. [Function] According to the present invention, a large amount of far infrared rays having a wavelength that has a high absorption rate in wet hair and a low absorption rate in dry hair is emitted. [Example] The present invention will be described in detail below based on the illustrated example. This hair dryer includes a cylindrical far-infrared heater 4 whose outer peripheral surface is a far-infrared radiation surface, and a motor 3 that rotates the hair dryer. The air blower is equipped with a driven fan 2 and the far infrared heater 4 as a wind tunnel, and a reflector plate 5 that reflects the far infrared rays emitted from the far infrared heater 4 in the air blowing direction. The air sent out from the device is heated by the heat given from the inner surface of the far-infrared heater 4 and is discharged as warm air. In the figure, 6 is an inlet grating, and 7 is an outlet grating. The far-infrared heater 4, which is designed to maximize the area of the far-infrared radiation surface, has a spiral shape on the outer peripheral surface of a cylindrical heater base 41 with a tapered tip, as shown in FIG. The heater wire 42 is wound along this groove 44, and the far-infrared radiator 43 is further coated on the outer peripheral surface of the heater base 41 around which the heater wire 42 is wound by baking or thermal spraying. Reference numeral 45 in FIG. 0, which is configured as a fixed part, is a lead-in hole for leading the heater wire 42 into the inner surface of the heater base 41. As shown in FIG. 3, the far-infrared radiator 43 here is made of a material that exhibits an emissivity of 90% or more over the entire far-infrared wavelength region, and even higher in the vicinity of the wavelength of 3 μm. And if we follow the Stefan-Boltzmann law mentioned above,
As shown in FIG. 5, the amount of far-infrared energy generated from the far-infrared radiator 43 increases in proportion to the fourth power of the temperature of the radiator. Energy peak wavelength [μ] T: radiator temperature [K] Considering that the higher the temperature of the far-infrared radiator 43 is, the shorter the energy peak wavelength becomes, the heating of the far-infrared radiator 43 by the heater wire 42 is set to 500 to 600 Hz. By setting it so that it is ℃, the energy peak wavelength is set to be around 3μ. In this way, this far-infrared hot air heater equipped with the far-infrared heater 4, which emits a large amount of far-infrared rays at wavelengths around 3μ, has a high absorption rate of far-infrared rays at the above-mentioned wavelengths in wet hair. In addition to being able to dry hair quickly, once the hair is dry, the absorption rate of far infrared rays of the above wavelength is reduced to 1/4, so the hair is not damaged.

【Effect of the invention】

As described above, the present invention is equipped with an infrared radiator that emits a large amount of infrared rays at a wavelength of around 3μ, which has a high absorption rate in wet hair and 1/4 of the absorption rate in dry hair. , which can effectively dry hair without damaging it.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of an embodiment of the present invention, Fig. 2 is a cutaway side view and enlarged sectional view of section A of the far-infrared heater shown above, and Fig. 3 is a spectral emissivity characteristic diagram of the far-infrared radiator shown above. , Fig. 4 is a far-infrared absorption wavelength characteristic diagram in hair, Fig. 5 is a radiant energy characteristic diagram using black body temperature as a parameter, Fig. 6 is a perspective view of the conventional example, and Fig. 7 is the same far-infrared radiation as above. It is a spectral emissivity characteristic diagram of the body, where 4 indicates a far-infrared heater and 43 indicates a far-infrared radiator. Agent Patent attorney Ishi 1) Chief 7 Figure 2 (b) Figure 5 Z table c voice) Figure 6

Claims (1)

[Claims] (1) A hair dryer characterized by being equipped with an infrared radiator that emits a large amount of infrared radiation in the vicinity of a wavelength of 3μ.